When I delete emails from my Thunderbird inbox a copy is placed in the 'Deleted items' folder on the Yahoo server
When I delete emails from my Thunderbird inbox a copy is placed in the 'Deleted items' folder on the Yahoo server. And when I send an email using Thunderbird a copy of is placed in the 'Sent items' folder on the Yahoo server.
I link Thunderbird to Yahoo using POP3. The 'Leave messages on server' box in Thunderbird is UNCHECKED.
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Hotmail and Gmail have for years added outgoing mail to the send folder as it passes through their outgoing SMTP server. I guess Yahoo are not doing the same thing,
It would be logical to have mail deleted off the server move to the deleted items folder. Again a similar approach is used by Hotmail, they move mail deleted using a mail client over pop to a pop mail folder in the deleted items. I know it is not what you are used to, but given the black box approach yahoo uses, it is a change I could see them making ithout any notification.